|Title:||Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856|
Vaquero, José M.
Ebihara, Yusuke https://orcid.org/0000-0002-2293-1557 (unconfirmed)
|Author's alias:||海老原, 祐輔|
|Journal title:||Annales Geophysicae|
|Abstract:||While low-latitude auroral displays are normally considered to be a manifestation of magnetic storms of considerable size, Silverman (2003, JGR, 108, A4) reported numerous “sporadic auroras” which appear locally at relatively low magnetic latitude during times of just moderate magnetic activity. Here, a case study is presented of an aurora near the geomagnetic equator based on a report from the Philippine islands on 27 October 1856. An analysis of this report shows it to be consistent with the known cases of sporadic auroras, except for its appearance at considerably low magnetic latitude. The record also suggests that an extremely low-latitude aurora is not always accompanied by large magnetic storms. The description of its brief appearance leads to a possible physical explanation based on an ephemeral magnetospheric disturbance provoking this sporadic aurora.|
|Rights:||© Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.|
|Appears in Collections:||Journal Articles|
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